I am having a hard time choosing a shore excursion for the stop in Hiroshima during our upcoming RSSC cruise from Tokyo to Hong Kong. These are my choices:

Day trip by bullet train to Okayama Castle and Korakuen Gardens.

Peace Memorial Park and Museum in Hiroshima.

Kintai Bridge and Iwakuni Castle.

Miyajimi Island and the Isukushima Shrine.

I am leaning toward the day trip by bullet train or Miyajima Island, but I would really appreciate any input from anyone who has visited this area and any of these places. Thanks!